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Ammonia decomposition in the thermochemical waste-heat recuperation systems: A view from low and high heating value

Pashchenko, Dmitry ; Mustafin, Ravil

Energy conversion and management, 2022-01, Vol.251, p.114959, Article 114959 [Peer Reviewed Journal]

Oxford: Elsevier Ltd

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  • Title:
    Ammonia decomposition in the thermochemical waste-heat recuperation systems: A view from low and high heating value
  • Author: Pashchenko, Dmitry ; Mustafin, Ravil
  • Subjects: Ammonia ; Calorific value ; Condensates ; Decomposition ; Decomposition reactions ; Flue gas ; Heat ; Heat balance ; Heat recovery ; Heating equipment ; Hydrogen-rich fuel ; Mathematical analysis ; Reactors ; Steam ; Thermochemical recuperation ; Thermodynamic analysis
  • Is Part Of: Energy conversion and management, 2022-01, Vol.251, p.114959, Article 114959
  • Description: [Display omitted] •Thermochemical waste-heat recuperation by ammonia decomposition.•The maximum heat recovery rate is 0.83 in the temperature range of 500–500 °C.•13% of steam from exhaust gas has to be condensed to compensate heat deficit.•Heat recuperated in a reactor is 2–5 times higher than heat recuperated in a preheater.•The maximum heat transformation coefficient is 1.16. This paper is devoted to the investigation of the thermochemical waste-heat recuperation system based on ammonia decomposition. Thermochemical waste-heat recuperation system consists of a reactor, an ammonia preheater, and a condenser. The thermodynamic analysis of the TCR system was performed via Aspen HYSYS software. The heat balance was calculated for the different operating parameters such as temperature (100–700°C) and pressure (1–20 bar). The heat balance showed that in the temperature range from 150–500°C there are heat deficits in the TCR system. To cover this deficit up to 15% of steam from flue gas have to be condensed. For compensating the heat deficit was suggested using a condenser after a preheater. The heat of H2O condensation is covered a significant part of the heat deficit. The heat recovery rate was determined and showed that the TCR system has a maximum efficiency in the temperature range above 500°C and pressure above 20 bar. The heat recuperated in the reactor is 2–5 times higher than the heat recuperated in the preheater. The heat transformation coefficient (ratio between the combustion heat of the ammonia decomposition products and ammonia) is about 1.16 for in the temperature range above 500°C.
  • Publisher: Oxford: Elsevier Ltd
  • Language: English
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